Measurement of the mass of the [tau] lepton

Journal Article · Mon Nov 23 00:00:00 EST 1992 · Physical Review Letters; (United States)

DOI:https://doi.org/10.1103/PhysRevLett.69.3021· OSTI ID:7012176

Bai, J Z; Bardon, O; Becker-Szendy, R A; Burnett, T H; Campbell, J S; Chen, S J; Chen, S M; Chen, Y Q; Cheng, Z D; Coller, J A; Cowan, R F; Cui, H C; Cui, X Z; Ding, H L; Du, Z Z; Dunwoodie, W; Fang, C; Fero, M J; Gao, M L; Gao, S Q ; Gao, W X; Gao, Y N; Gu, J H; Gu, S D; Gu, W X; Guo, Y N; Guo, Y Y; Han, Y; Hatanaka, M; He, J; Hitlin, D G; Hu, G Y; Hu, T; Huang, D Q; Huang, Y Z; Izen, J M; Jia, Q P; Jiang, C H; Jiang, Z J; Johnson, A S; Jones, L A; Kelsey, M H; Lai, Y F; Lang, P F; Lankford, A; Li, F; Li, J; Li, P Q; Li, Q M; Li, R B; Li, W; Li, W D; Li, W G; Li, Y S; Lin, S Z; Liu, H M; Liu, Q; Liu, R G; Liu, Y; Lowery, B; Lu, J G; Ma, D H; Ma, E C; Ma, J M; Mandelkern, M; Marsiske, H; Mao, H S; Mao, Z P; Meng, X C; Ni, H L; Pan, L J; Panetta, J H; Porter, F C; Prabhakar, E N; Qi, N D; Que, Y K; Quigley, J; Rong, G; Schmid, B; Schultz, J; Shank, J T; Shao, Y Y; Shen, D L; Sheng, H Y; Shi, H Z; Smith,

The mass of the [tau] lepton has been measured at the Beijing Electron-Positron Collider using the Beijing Spectrometer. A search near threshold for [ital e][sup +][ital e[minus]][r arrow][tau][sup +][tau][sup [minus]] was performed. Candidate events were identified by requiring that one [tau] decay via [tau][r arrow][ital e][nu][bar [nu]], and the other via [tau][r arrow][mu][nu][bar [nu]]. The mass value, obtained from a fit to the energy dependence of the [tau][sup +][tau][sup [minus]] cross section, is [ital m][sub [tau]]=1776.9[sub [minus]0.5][sup +0.4][plus minus]0.2 MeV.

• DOE Contract Number: AC02-76ER03069; AC35-89ER40486; FG05-92ER40736
• OSTI ID: 7012176
• Journal Information: Physical Review Letters; (United States), Vol. 69:21; ISSN 0031-9007
• Country of Publication: United States
• Language: English

Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
ELECTRON-POSITRON INTERACTIONS
ANNIHILATION
TAU PARTICLES
MASS
BRANCHING RATIO
CROSS SECTIONS
ERRORS
EXPERIMENTAL DATA
LEPTONIC DECAY
MUONS
BASIC INTERACTIONS
DATA
DECAY
ELECTROMAGNETIC INTERACTIONS
ELEMENTARY PARTICLES
FERMIONS
HEAVY LEPTONS
INFORMATION
INTERACTIONS
LEPTON-LEPTON INTERACTIONS
LEPTONS
NUMERICAL DATA
PARTICLE DECAY
PARTICLE INTERACTIONS
POSTULATED PARTICLES
WEAK INTERACTIONS
WEAK PARTICLE DECAY
662430* - Properties of Leptons- (1992-)
662310 - Weak & Electromagnetic Interactions of Leptons- (1992-)